Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b81254576868f89…

MALICIOUS

PDF

73.3 KB Created: 2021-03-04 23:48:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 20c53501e404435fa1d4821b84c96f9b SHA-1: de66ca89c359e46d86aff7d290fdf69b1101a292 SHA-256: 2b81254576868f897e58214eeee2c0f05fd1fc0739136205add1cd5565f59e13
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://golowaki.ru/strik?utm_term=demon+hunter+dps+build+diablo+3 PDF link annotation
    • http://familyit.info/miraculous_ladybug_amino_engliship8iy.pdfIn PDF document text
    • http://com-signto2.xyz/423328293014o0jq.pdfIn PDF document text
    • http://varietystore.website/how_to_pair_resoundhwa0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380695/normal_601d0ee3736b4.pdfIn PDF document text
    • http://gk-kuban.ru/die_kleine_raupe_nimmersatt3gg9c.pdfIn PDF document text
    • http://levelupguild.com/chittagong_pola_noakhali_maiya_full_moviecn6uy.pdfIn PDF document text
    • http://lodixewovufosa.iblogger.org/27253270133.pdfIn PDF document text
    • http://barashik.space/lost_island_blast_adventure_mod_apk_terbaruqvczs.pdfIn PDF document text
    • http://storeeuro.info/what_cards_are_issued_by_metabank0oah2.pdfIn PDF document text
    • http://ericksandoval.com/skylanders_imaginators_xbox_one_redeem_codern585.pdfIn PDF document text
    • http://latuha.com/brushless_alternator_seminar_reportva2sz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501045/normal_603fab398b70b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/678d10e9-b563-486f-b10a-5c32345d1aa9/49061899597.pdfIn PDF document text
    • http://kinamanerat.epizy.com/year_4_mental_maths_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/386cfbcb-a2d6-4c03-ba8a-ddf8d39b4eb8/tenugaxekiligavimavupovol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db922675-bbc2-4f42-a640-e79f708545ce/zivubuweg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a28a066f-79a7-4a27-b30c-ec0f63783996/download_driver_hp_laserjet_3015_windows_7_64_bit.pdfIn PDF document text
    • http://zadosuwiwebuw.epizy.com/a_mothers_reckoning.pdfIn PDF document text
    • https://f62823ea-e863-4eb7-bd7c-e3bac0139ff1.filesusr.com/ugd/8c639a_daa6a5abd8bf4ba5be82148f5606f2f9.pdf?index=trueIn PDF document text
    • https://2d841ef3-a248-4e6a-996b-2d54d6713fdd.filesusr.com/ugd/1decf9_7ead64d7878147af8d769dba153aaab9.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE169 5504 bytes
SHA-256: 67f6959e1f909afe8dbc73d0ebd1bdda3c62d632da5fa95b63526d2ac6f69393
font_01_sfnt_off0000f3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3ED 10624 bytes
SHA-256: 35cd5e3119728644fd1bd001719664ad98876fe0e9b65318b2ddd041f2cb8411

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